Phonolite - Wikipedia
Phonolite is an uncommon shallow intrusive or extrusive rock, of intermediate chemical composition between felsic and mafic, with texture ranging from aphanitic (fine-grained) to …
Phonolite | Volcanic, Igneous, Intrusive | Britannica
Phonolite, any member of a group of extrusive igneous rocks (lavas) that are rich in nepheline and potash feldspar. The typical phonolite is a fine-grained, compact igneous rock that splits into …
Phonolite : Properties, Occurrence, Compositions - Geology Science
2023年11月24日 — Phonolite is a type of volcanic rock that belongs to the family of igneous rocks. It is characterized by its unique mineral composition and texture, which set it apart from other …
Phonolite - an overview | ScienceDirect Topics
Phonolite is a subvolcanic rock variety characterized by the presence of variable amounts of pyroxene and phenocrysts of sanidine, nepheline, diopside, nosean, kaersutite, and titanite, …
Tephritic phonolite - ALEX STREKEISEN
Tephritic phonolite Phonolites: Phonolites are extrusive rocks that are essentially composed of alkali feldspar (Anorthoclase and Sanidine), mafic minerals such as alkali amphiboles, alkali …
Phonolite - SpringerLink
With increasing plagioclase, phonolites grade (through tephritic phonolite and phonolitic tephrite) into tephrites and basanites (when olivine-bearing). Clinkstone, echodolite, and klingstein are …
How the Tower Formed - U.S. National Park Service
2019年12月5日 — We know that the Tower is formed of a rare igneous rock, phonolite porphyry, and is the largest example of columnar jointing in the world. To better understand processes …
Phonolite - Encyclopedia.com
2018年5月8日 — phonolite A fine-grained, porphyritic, extrusive, igneous rock consisting of essential alkali feldspar (sanidine or anorthoclase), nepheline, sodic pyroxene, and sodic …
5.1: Introduction - Geosciences LibreTexts
Figure 1. Devil’s Tower in Wyoming is one of the most famous outcrops of igneous rock in the world. It is composed of an igneous rock type called phonolite porphyry.
Phonolite - newtonsdisciple.com
Phonolite is a rare igneous, volcanic (extrusive) rock of intermediate composition, with aphanitic to porphyritic texture. Phonolite is unusual in that it forms from a highly silica undersaturated melt …
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